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  1. Fresh water sponges; a monograph, by Edward Potts, including "Diagnosis of European spongillidae," by Franz Vejdovsky.
    By: Potts, Edward. - Vejdovský, Frantisek, - Academy of Natural Sciences of Philadelphia.
    Publication info: Philadelphia,Academy of Natural Sciences,1887.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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